Diaphragm pump



FIG. 1 shows a front view of a diaphragm pump showing my new design;

FIG. 2 shows a top view thereof;

FIG. 3 shows a bottom view thereof;

FIG. 4 shows a right side view thereof

FIG. 5 shows a left side view thereof;

FIG. 6 shows an inside view thereof taken along line 6—6 on FIG. 1; and,

FIG. 7 shows a perspective view thereof. 

The ornamental design for a diaphragm pump, as shown and described. 